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B13 (MainAgent classify, P0): - Add ClassifyMode: 'regex' | 'llm' with ProviderManager injection - classify() returns string|Promise<string>, routed via classify_mode - Add classify_via_llm() stub with classification prompt structure - Alpha default: regex (deterministic), GA target: llm - classify_regex() now also matches /direct and /done commands - handle_user_message uses await Promise.resolve() for dual-mode B14 (IPC WorkerMessage envelope, P0): - WorkerMessage: add kind, session_id, agent_id fields + optional correlation_id?, protocol_version? (contracts §10 IpcKind alignment) - create_message() accepts opts for session_id/agent_id/correlation_id - WorkerRuntime.send_message() now populates kind/session_id/agent_id/protocol_version - decode() backward compatible (options fields default to empty) Test: 169/169 pass (0 fail). All 26 cross-audit blockers now closed: 24 fixed, 2 Alpha-scope (B13 llm path exists as stub). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>